Yes! I had a search up in that area a couple years ago. The girl took an unmaintained trail, off the west/north side of the main trail. She ended up in the Boulder Creek Wilderness. It's not a place you want to be in if you aren't prepared. It's beautiful in there, but the trails are not maintained, masses of blow downs, and animal trails crossing the main (old) trail which appear to be the main trail until they die out. You need good navigation skills if you go in there. The canyon walls are vertical in a lot of places, and cell and gps and even radio communications are really spotty. We had a relay radio station set up and still had problems.
She didn't have a map, compass, or gps. She was only in for a day hike. We were called in on day 3. She hadn't shown up for work and her boss called it in. We left the trailhead at 7 am. We tracked her for 8 hours straight, moving as fast as we could, with only a couple of 5-10 minute breaks. My partner, a deputy, was overcome by the heat, at about 3 pm, about 3 miles from the trailhead at the opposite end of the Wilderness area. (this was in July) I called in an airdrop for supplies to stave off heat stroke, but he still had to be carried out on a stokes stretcher. There was no-where to get a helicopter in to safely hoist him up, as the canyon is so steep. He would have had to be hoisted up through the tree canopy and was too weak to hold on to an extractor. We finally got out of there the next morning at 5 am. Him in an ambulance, me, feeling like a jellyfish after a hurricane.
The paramedic who hiked in to treat him encountered a large black bear, (he estimated 600 lbs. Said it was the biggest black bear he had ever seen, and he is a SAR tech, and has been for years.) that would not back down, even though there were 4 or 5 people in his group. The area is prime berry country. They had to back out. They tried to get a mule in even though we warned them not to, but the mule got stuck up to it's belly in mud trying to circumnavigate a huge mass of wind-fall.
Mountain Rescue found her on day 5, about 1/2 mile from where we had to stop tracking due to the heat exhaustion. She said she heard the helicopter on day three, (as they were positioning to do the drop ) and tried to signal it by shouting. 
Besides the fact that we could easily have had a fatality of a SAR person, (yes, it was that bad, ) the next greatest difficulty for me was the hordes of mosquitos. I have lived in the woods my entire life, and I have NEVER seen mosquitos like that. We had deet on, but they were still in our eyes, nose and mouth. The most pitiful thing was the dogs. They were inhaling masses of them as they were panting, but they wouldn't quit tracking her. The mosquitos were so thick, we could kill a dozen with one slap. It was unreal. I have truly never experienced anything like it before or since. I hope I never do. I just don't have the words to describe that experience.
My point in telling you this horror story: If you stick to the main trail, you should be o.k. If you leave the trail, well, they don't call it Dread and Terror for nothing! 
If you get off the other side of the trail, you end up in the Umpqua River Canyon, and it is vertical in places on that side as well. Either way, don't leave the main trail unless you are looking for a real adventure, epic Bear Gryllis type adventure.